usr/src/lib/libcurses/insertln.c

# include       "curses.ext"

/*
 *      This routine performs an insert-line on the window, leaving
 * (_cury,_curx) unchanged.
 *
 * %G% (Berkeley) @(#)insertln.c        1.3
 */
winsertln(win)
reg WINDOW      *win; {

        reg char        *temp;
        reg int         y;
        reg char        *end;

        temp = win->_y[win->_maxy-1];
        win->_firstch[win->_cury] = 0;
        win->_lastch[win->_cury] = win->_maxx - 1;
        for (y = win->_maxy - 1; y > win->_cury; --y) {
                win->_y[y] = win->_y[y-1];
                win->_firstch[y] = 0;
                win->_lastch[y] = win->_maxx - 1;
        }
        for (end = &temp[win->_maxx]; temp < end; )
                *temp++ = ' ';
        win->_y[win->_cury] = temp - win->_maxx;
}